Jekyll2026-05-05T02:51:25+00:00/feed.xmlAaron SharpewebsiteVisit to UIUC2024-10-17T00:00:00+00:002024-10-17T00:00:00+00:00/news/2024/10/17/uiucThanks so much to everyone at UIUC for a wonderful visit, particularly my hosts, Taylor Hughes and Philip Phillips. It was a tremendous honor to receive this year’s McMillan award. Bill was an incredible physicist and apparently quite the character. You can read more about Bill here.

McMillan Award
]]>Publication: Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices2024-09-27T00:00:00+00:002024-09-27T00:00:00+00:00/news/2024/09/27/publish_rupiniI am excited to announce that Rupini Kamat and my paper has been accepted to PNAS! When trying to form a moiré between different materials, one previously relied on aligning straight edges of exfoliated materials as a proxy for the crystallographic axes. However, for graphene and hexagonal boron nitride, these straight edges can represent either zig-zag or arm-chair termination in roughly equal proportion. This results in a 50-50 chance of improper alignment. Rupini and I set out to remove this ambiguity by directly measuring the various crystallographic axes in the problem. Check it out here: https://www.pnas.org/doi/10.1073/pnas.2410993121.

]]>Publication: Torsional force microscopy of van der Waals moirés and atomic lattices2024-03-01T00:00:00+00:002024-03-01T00:00:00+00:00/news/2024/03/01/publish_mihirCongrats to Mihir et al. on the acceptance of his paper to PNAS. Mihir and others have developed a really nice and reliable technique for imaging moire and atomic lattices. It is quite easy to get up and running on any Bruker Icon: ( https://www.pnas.org/doi/abs/10.1073/pnas.2314083121).

]]>Publication: Unusual magnetotransport in twisted bilayer graphene, now with strain!2023-09-17T00:00:00+00:002023-09-17T00:00:00+00:00/news/2023/09/17/publish_joeCongrats to Xiaoyu and Joe on the acceptance of their paper to PNAS. They really have a beautiful understanding of just about every detail in the device! Check it out here: https://doi.org/10.1073/pnas.2307151120.

When incorporating uniaxial heterostrain into the continuum model, the degeneracy of the Dirac cones and van Hove points are lifted. This leads to three Lifshitz transitions: (1) a transition from two to one Fermi pockets which we observe in quantum oscillations; (2) a transition to open orbits where we observe non-saturating magnetoresistance; and (3) a transition to hole-like pockets.

This model also predicts that the principal axes of transport are now density-dependent! They will rotate as a function of filling for a given uniaxial strain amount and direction.

]]>March Meeting2023-03-13T00:00:00+00:002023-03-13T00:00:00+00:00/publication/2023/03/13/mmIt was great to catch up with a lot of people I have not seen in a long time and meet a bunch of new people at March meeting. If you made it to my site to check out the slides of my talk, you can find them here. Feel free to reach out with any questions!

]]>Temporarily moving to Boston2023-03-13T00:00:00+00:002023-03-13T00:00:00+00:00/news/2023/03/13/bostonFor the next 6 months, I will be visiting MIT, primarily collaborating with Pablo Jarillo-Herero. If you are in the area and would like to catch up, send me an email!

]]>Publication: Unusual magnetotransport in twisted bilayer graphene from strain-induced open Fermi surfaces2022-09-17T00:00:00+00:002022-09-17T00:00:00+00:00/publication/2022/09/17/publish_strainHere is the latest paper to come out of the strain project I have been lucky to be a part of with Joe Finney and (now) Xiaoyu Wang. Uniaxial heterostrain can lead to a large range of densities where the Fermi surface becomes open, providing a very plausible explanation for some of the effects we previously observed, like non-saturating magnetoresistance. You can check it out here.

]]>Publication: Stacks on stacks on stacks2022-07-08T00:00:00+00:002022-07-08T00:00:00+00:00/publication/2022/07/08/publish_stacksI recently served as a referee for two exciting papers focusing on multilayer twisted graphene stacks (1, 2). These papers found physics reminiscent but slightly different than magic-angle twisted bilayer graphene in four- and five-layer graphene stacks with an alternating twist angle between adjacent layers. After reviewing, I was invited to write a News and Views article on the two papers. You can check it out here.

]]>Publication: Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO22022-05-09T00:00:00+00:002022-05-09T00:00:00+00:00/publication/2022/05/09/publish_majaCongrats to Maja Bachmann on the acceptance of her latest paper to Nature Physics. Check it out here: (https://rdcu.be/cNbEN). We hopefully will publish one more paper on this topic.

]]>Publication: Unusual magnetotransport in twisted bilayer graphene2022-04-12T00:00:00+00:002022-04-12T00:00:00+00:00/preprint/2022/04/12/publish_joeCongrats to Joe Finney (spxtr) on the acceptance of his paper to PNAS. Check it out here: (https://www.pnas.org/doi/10.1073/pnas.2118482119).

]]>